Port 9909
domaintime · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | domaintime |
Frequently asked questions
What is port 9909 used for?
Port 9909 is registered with the IANA for domaintime (TCP/UDP). Description: domaintime.
Is port 9909 a well-known port?
No. Port 9909 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 9909 is open?
Locally on Linux with ss -tulpn | grep ':9909\b', on Windows with netstat -ano | findstr :9909. To test a remote host use Test-NetConnection <host> -Port 9909 in PowerShell or nc -zv <host> 9909 on Linux/macOS.
How do I open port 9909 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 9909/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9909/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9909" -Direction Inbound -Protocol TCP -LocalPort 9909 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | domaintime | domaintime |
| UDP | domaintime | domaintime |